Math Problems - Page 2

Linaewen · 05-03-2003, 10:22 AM

Quote:

Originally posted by Lalaith
do you have all the exams at the same time?

Sorry, I was referring to what I am going to study tomorrow. Actually, all my exams are in one week. A couple a day...

Lalaith · 05-03-2003, 10:27 AM

Quote:

Originally posted by Linaewen
Sorry, I was referring to what I am going to study tomorrow. Actually, all my exams are in one week. A couple a day...

That's cruel, but we will have that next year.

miss_poet · 05-03-2003, 12:47 PM

I am going to HATE exams...I am studying...wait...I am not going to tell you because that gives away the answer to the problem!

Keep guessing! You are getting off subject

Want me to tell you the answer?

Bunnie_Queen_1146 · 05-03-2003, 10:53 PM

that math is kind of confusing?

Estel13 · 05-03-2003, 11:04 PM

Quote:

Originally posted by Sminty_Smeagol
well... if a= -6 and it was -a, would that mean 6 (double negative)? or was that a typo or something?

if double negative, 26,right?

Actually, it's 24. But it's pretty easy stuff.
I'm trying to finish Algebra I before the end of the year. Meaning, if I've done 30 lessons out of 120, and school ends the last day of May, and there are 15 problems in every lesson..... It ain't gonna happen. Hey, I can dream, can't I?!

***Jonathan*** · 05-04-2003, 01:05 PM

When I was bored at my practical vocational training place in Paris, I came up with some maths problems in my head just to keep myself awake.
I calculated every answer to 2^X, where 0<x<25 (integers) and learnt the answers by heart.

Legolas_Frodo_Aragorn · 05-04-2003, 01:16 PM

Does anyone know how to multiply matrixs???i kinda forget and it doesnt explain it in the book
its from honors algebra 2

Ragnarok · 05-04-2003, 05:37 PM

Quote:

Originally posted by miss_poet
I am sorry, but that is incorrect. That uses over 100 digits, not THREE. Only use 3 digits. Would you like to know the answer, or keep guessing because none of you are near close?

I think he was solving for Sminty's problem: What's 1+2+3+4+5+........... all the way to +100?

Ragnarok · 05-04-2003, 05:39 PM

Quote:

Originally posted by Legolas_Frodo_Aragorn
Does anyone know how to multiply matrixs???i kinda forget and it doesnt explain it in the book
its from honors algebra 2

Yea, do you have a graphing calc. because you can plug it in easily and get the answer fast using one.

***IronParrot*** · 05-04-2003, 06:12 PM

Except there comes a point when you have to multiply matrices without calculators.

Assuming that the two matrices in questions match dimensions (i.e. an MxN multiplied by an NxO): let's call the first matrix A, and the second one B. Then the i,j entry of AxB would be the sum of each term in the i-th row of A multiplied by the corresponding term in the j-th row of B, as if you were doing a dot product of two vectors. Follow that general case, and you've got every entry filled out.

As for the three-digit problem, are factorials allowed?

Coney · 05-04-2003, 07:31 PM

Don't ask me

................. I have to take my shoes and socks off to count to twenty

Linaewen · 05-07-2003, 07:56 AM

Quote:

Originally posted by Jonathan
When I was bored at my practical vocational training place in Paris, I came up with some maths problems in my head just to keep myself awake.
I calculated every answer to 2^X, where 0<x<25 (integers) and learnt the answers by heart.

You calculated that all in your head? No pen or paper? Yikes! I like maths and I'm pretty good at it, but you people just make me feel stupid in every area.

Lalaith · 05-07-2003, 04:27 PM

Quote:

Originally posted by Legolas_Frodo_Aragorn
Does anyone know how to multiply matrixs???i kinda forget and it doesnt explain it in the book
its from honors algebra 2

I think it should be called Matrices. Uh, anybody has mentioned it before I could.

I'm having maths problems too. It's a little embarrasing. A student has to ask D student to explain Maths things.

Linaewen · 05-08-2003, 09:32 AM

Quote:

Originally posted by Lalaith
I think it should be called Matrices. Uh, anybody has mentioned it before I could.

I'm having maths problems too. It's a little embarrasing. A student has to ask D student to explain Maths things.

Do you mean a D-grade student? Actually, that's the average of my class- we are an accelerated class and basically, all our grades are suffering. (Mine are not so bad, tho)

Hey, at least you're getting help.

Lalaith · 05-08-2003, 09:41 AM

Quote:

Originally posted by Linaewen
Do you mean a D-grade student? Actually, that's the average of my class- we are an accelerated class and basically, all our grades are suffering. (Mine are not so bad, tho)

Hey, at least you're getting help.

I used to sit next to this annoying girl (was one of my best friends) and she always disturbed me, now I'm sitting next to the other girl (yes, D grade student) and I understand everything again. Hurray. No more problems.

Janny · 04-12-2004, 12:09 PM

Is there anyone else who has an interest in pure maths? Is anyone studying it, or has an interest in it or its history?

Also would anyone be interested in posting brainteasers or puzzles? (Or would this be spamming?

)

mithrand1r · 04-12-2004, 12:31 PM

Yes, I have an interest in Mathematics. History of Mathematics is fun.

Puzzle for today: form a magic square that is 6x6.

Below is an example of a 3x3 magic square:

------------15
------------
| 08-01-06 | = 15
| 03-05-07 | = 15
| 04-09-02 | = 15
------------
| 15-15-15 - 15

The rows and columns and the 2 diagonals all total the same amount. (in this case 15, using the numbers from 1-9 inclusive)
======================
6x6 would use 36 consecutive numbers (1-36 for one example)

Janny · 04-12-2004, 12:38 PM

Ok, but first tell me what's wrong with this.
('^2' is squared)

Let a = b
Therefore a^2 = ab
" a^2 - 2ab = - ab
" 2 a^2 - 2ab = a^2 - ab
" 2 (a^2 - ab) = a^2 - ab
" 2 = 1

Radagast The Brown · 04-12-2004, 01:40 PM

Quote:

Originally posted by Janny
Ok, but first tell me what's wrong with this.
('^2' is squared)

Let a = b
Therefore a^2 = ab
" a^2 - 2ab = - ab
" 2 a^2 - 2ab = a^2 - ab
" 2 (a^2 - ab) = a^2 - ab
" 2 = 1

You divided in 0 - because a^2=ab => a^2- ab=0.

***Jonathan*** · 04-12-2004, 01:51 PM

Oh yeah, I love mathematics

. There are already sevelar threads about the subject though.
Math Problems (Admins, merge this thread with that?),
math and Elven populations (

) and
do you like math?

Someone tell me what's wrong with this

:

Theorem: 0.9999... (to infinity) equals 1.

lim(m --> infinity) sum(n = 1)^m (9)/(10^n) = 1
0.9999... = 1

Thus x = 0.9999...
10x = 9.9999...
10x - x = 9.9999... - 0.9999...
9x = 9
x = 1.

Quote:

Originally posted by Janny
" 2 (a^2 - ab) = a^2 - ab
" 2 = 1

You cannot divide both sides with (a^2 - ab) and get 2 = 1. If you do, you will get

2 = (a^2)/(a^2 - ab) - ab/(a^2 - ab)
not
2 = 1

05-03-2003, 12:47 PM	#23
miss_poet Enting Join Date: Apr 2003 Location: Rivendell :-) Posts: 68	Exams I am going to HATE exams...I am studying...wait...I am not going to tell you because that gives away the answer to the problem! Keep guessing! You are getting off subject Want me to tell you the answer? __________________ As I look into the sky and sit and watch the stars I think of you. I wonder if you remember me the way I was or the way I am now. I know I will always keep a place for you in my heart. Even though the shadows fall and the darkness enters you will always be with me. I remember one thing about you. Your eyes. I used to look in them like pools of blue water. I could stare at them forever like the dark blue sky on a cloudy night. As I sit here still watching the stars I think of you, but the one thing I remember is your eyes.

05-03-2003, 10:53 PM	#24
Bunnie_Queen_1146 90% angel Join Date: Feb 2003 Location: Unknown>:) Posts: 243	that math is kind of confusing? __________________ Call me BQ orTiny. Since I can't change my user name.lol Don't you remember/ The fizz in a pepper/Peanuts in a bottle/At ten, two and four/A fried bologna sandwich/With mayo and tomato/Sittin' round the table/Don't happen much anymore /Back when a hoe was a hoe/Coke was a coke/And crack's what you were doing/When you were cracking jokes/Back when a screw was a screw/The wind was all that blew/And when you said I'm down with that Well it meant you had the flu/I miss back when

05-04-2003, 01:05 PM	#26
*Jonathan* Entmoot Attorney-General, Equilibrating the Scales of Justice, Administrator ♎ Join Date: Jan 2003 Location: Stockholm, Sweden Posts: 3,891	When I was bored at my practical vocational training place in Paris, I came up with some maths problems in my head just to keep myself awake. I calculated every answer to 2^X, where 0<x<25 (integers) and learnt the answers by heart. __________________ An unwritten post is a delightful universe of infinite possibilities. Set down one word, however, and it immediately becomes earthbound. Set down one sentence and it’s halfway to being just like every other bloody entry that’s ever been written. ☻

05-04-2003, 01:16 PM	#27
Legolas_Frodo_Aragorn The Elven Queen Of All Pyros Join Date: Jan 2003 Location: Im like a little bug stuck in the lamp...never going anywhere Posts: 795	matrix's Does anyone know how to multiply matrixs???i kinda forget and it doesnt explain it in the book its from honors algebra 2 __________________ Would you judge my future based on what i did in the past? Procrastinators Unite!!!.....tomorrrow.... Kids in backseats cause accidents...accidents in backseats cause kids As long as there are tests..there will be prayers in school

05-04-2003, 06:12 PM	#30
*IronParrot* Fowl Administrator Join Date: Dec 1999 Location: Calgary or Edmonton, Canada Posts: 53,420	Except there comes a point when you have to multiply matrices without calculators. Assuming that the two matrices in questions match dimensions (i.e. an MxN multiplied by an NxO): let's call the first matrix A, and the second one B. Then the i,j entry of AxB would be the sum of each term in the i-th row of A multiplied by the corresponding term in the j-th row of B, as if you were doing a dot product of two vectors. Follow that general case, and you've got every entry filled out. As for the three-digit problem, are factorials allowed? __________________ All of IronParrot's posts are guaranteed to be 100% intelligent and/or sarcastic, comprising no genetically modified content and tested on no cute furry little animals unless the SPCA is looking elsewhere. If you observe a failure to uphold this warranty, please contact a forum administrator immediately to receive a full refund on your Entmoot registration. Blog: Nick's Café Canadien

05-04-2003, 07:31 PM	#31
Coney The Buddy Rabbit Join Date: Oct 2002 Location: Trapped in the headlights.. Posts: 3,372	Don't ask me ................. I have to take my shoes and socks off to count to twenty __________________ Blessed are the cracked, they let the light in Beatallica

04-12-2004, 12:09 PM	#36
Janny The Blobbit Join Date: Feb 2004 Location: Kent, England (Not Oxford! ... yet...) Posts: 1,596	Maths Is there anyone else who has an interest in pure maths? Is anyone studying it, or has an interest in it or its history? Also would anyone be interested in posting brainteasers or puzzles? (Or would this be spamming? ) __________________ Janny's Songs Janny's lyrics and random photographs Tradition means giving votes to the most obscure of all classes, our ancestors. It is the democracy of the dead. Tradition refuses to submit to the small and arrogant oligarchy of those who happen to be walking about. ~ Mercutio... erm, GK Chesterton.

04-12-2004, 12:31 PM	#37
mithrand1r Cyber Elf Lord Join Date: Sep 2001 Location: Left of Rock, Right of Hard Place Posts: 986	Yes, I have an interest in Mathematics. History of Mathematics is fun. Puzzle for today: form a magic square that is 6x6. Below is an example of a 3x3 magic square: ------------15 ------------ \| 08-01-06 \| = 15 \| 03-05-07 \| = 15 \| 04-09-02 \| = 15 ------------ \| 15-15-15 - 15 The rows and columns and the 2 diagonals all total the same amount. (in this case 15, using the numbers from 1-9 inclusive) ====================== 6x6 would use 36 consecutive numbers (1-36 for one example) __________________ Sincerely, Anthony 'Many are my names in many countries,' he said. 'Mithrandir among the Elves, Tharkûn to the Drarves; Olórin I was in my youth in the West that is forgotten, in the South Incánus, in the North Gandalf; to the East I go not.' Faramir What nobler employment, or more valuable to the state, than that of the man who instructs the rising generation? Cicero (106BC-43BC) Last edited by mithrand1r : 04-12-2004 at 12:33 PM.

04-12-2004, 12:38 PM	#38
Janny The Blobbit Join Date: Feb 2004 Location: Kent, England (Not Oxford! ... yet...) Posts: 1,596	Ok, but first tell me what's wrong with this. ('^2' is squared) Let a = b Therefore a^2 = ab " a^2 - 2ab = - ab " 2 a^2 - 2ab = a^2 - ab " 2 (a^2 - ab) = a^2 - ab " 2 = 1 __________________ Janny's Songs Janny's lyrics and random photographs Tradition means giving votes to the most obscure of all classes, our ancestors. It is the democracy of the dead. Tradition refuses to submit to the small and arrogant oligarchy of those who happen to be walking about. ~ Mercutio... erm, GK Chesterton.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Math	trolls' bane	General Messages	53	02-06-2009 08:55 PM
Problems Posting	Valandil	Feedback and Tech Problems	1	07-18-2006 11:28 AM
Can't post or stay logged in? Cookie problems	Ben	Feedback and Tech Problems	1	10-22-2004 01:55 AM